Effect of crack opening velocity on fracture behavior of hyperelastic semi-structural adhesive joints subjected to mode I loading

Schmandt, Christopher; Marzi, Stephan

doi:10.1016/j.prostr.2018.12.154

Procedia Structural Integrity

2018

DOI: 10.1016/j.prostr.2018.12.154

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Effect of crack opening velocity on fracture behavior of hyperelastic semi-structural adhesive joints subjected to mode I loading

Christopher Schmandt

Stephan Marzi

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Cited by 5 publications

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“…In this respect, many authors have measured fatigue design curves for adhesives, but the vast majority have focused on structural adhesives [9,[20][21][22][23]. The investigations with elastomeric adhesives have either been limited to one geometry [11,12,16] or have approached the lifetime as a whole without differentiating the initiation/propagation phases [5,24,25].…”

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confidence: 99%

Compliance-Based Determination of Fatigue Design Curves for Elastomeric Adhesive Joints

Fernandes,

Nagel,

Wulf

et al. 2023

Eng

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A compliance-based method for the determination of fatigue design curves for elastomeric adhesive joints is developed and validated. Fatigue experiments are conducted on elastomeric adhesives (a polyurethane and a silane-modified polymer) under different stress ratios (R = 0.1/0.5/−1) and conditions (23 °C/50% r.h. and 40 °C/60% r.h.). The investigation focused on butt and thick adherent shear test joints. Fatigue tests are recorded with cameras to identify the stages of crack initiation and propagation. For each fatigue test, the stiffness and compliance per cycle are calculated until final failure. The proposed method identifies a transition point that distinguishes regions under stable and unstable compliance growth. Fatigue design curves are then built based on the transition point and on the number of cycles to reach different degrees of initial stiffness (90%, 80%, 70% and 60%). The failure ratio, i.e., the lifetime for reaching a given approach divided by the total lifetime, is introduced to evaluate the data in terms of average values and standard deviation. The results indicate that the proposed method can yield fatigue design curves with a high coefficient of determination (accuracy) and high failure ratio (avoiding over-conservative design). Moreover, the method is robust, as the failure ratio for different adhesives, stress ratios, conditions and geometries is highly consistent.

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confidence: 99%

Compliance-Based Determination of Fatigue Design Curves for Elastomeric Adhesive Joints

Fernandes,

Nagel,

Wulf

et al. 2023

Eng

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show abstract

Mode I fracture of thick adhesively bonded GFRP composite joints for wind turbine rotor blades

Fan,

Vassilopoulos,

Michaud

2024

Composite Structures

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Mode I creep fracture of rubber-like adhesive joints at constant crack driving force

Schrader

Schmandt

Marzi

2022

International Journal of Adhesion and Adhesives

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Effect of crack opening velocity on fracture behavior of hyperelastic semi-structural adhesive joints subjected to mode I loading

Cited by 5 publications

References 11 publications

Compliance-Based Determination of Fatigue Design Curves for Elastomeric Adhesive Joints

Compliance-Based Determination of Fatigue Design Curves for Elastomeric Adhesive Joints

Mode I fracture of thick adhesively bonded GFRP composite joints for wind turbine rotor blades

Mode I creep fracture of rubber-like adhesive joints at constant crack driving force

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